The Hawaiian bobtail squid is a master of camouflage, even using luminous bacteria as part of its nighttime disguise.
For more cool squid science, visit the Glowing Squid page on Science Nation: http://www.nsf.gov/news/special_reports/science_nation/glowingsquid.jsp
For more Science Nation episodes, visit: http://www.nsf.gov/news/special_reports/science_nation/